Flavor—parity breaking in the NJL model with Wilson fermions

String breaking with dynamical Wilson fermions

G. S. Bali, Th. Düssel Th. Lippert, H. Neff, Z. Prkaçin, K. Schilling Department of Physics & Astronomy, The University of Glasgow, Glasgow G12 8QQ, Scotland Zentralinstitut für Angewandte Mathematik, Forschungszentrum Jülich, D-52425 Jülich, Germany Center for Computational Science, Boston University, 3 Cummington St., Boston MA02215, USA Fachbereich Physik, Bergische Universität Wuppertal, Ga...

Spontaneous Flavor and Parity Breaking with Wilson Fermions

We discuss the phase diagram of Wilson fermions in the m0–g 2 plane for twoflavor QCD. We argue that, as originally suggested by Aoki, there is a phase in which flavor and parity are spontaneously broken. Recent numerical results on the spectrum of the overlap Hamiltonian have been interpreted as evidence against Aoki’s conjecture. We show that they are in fact consistent with the presence of a...

Spontaneous Breaking of Flavor Symmetry and Parity in the Nambu-Jona-Lasinio Model with Wilson Fermions

We study the lattice Nambu-Jona-Lasinio model with two flavors of Wilson fermions in the large N limit, where N is the number of ‘colors’. For large values of the fourfermion coupling we find a phase in which both, flavor symmetry and parity, are spontaneously broken. In accordance with general expectations there are three massless pions on the phase boundary, but only two of them remain massle...

Flavour Breaking Effects of Wilson twisted mass fermions

We study the flavour breaking effects appearing in the Wilson twisted mass formulation of lattice QCD. In this quenched study, we focus on the mass splitting between the neutral and the charged pion, determining the neutral pion mass with a stochastic noise method to evaluate the disconnected contributions. We find that these disconnected contributions are significant. Using the Osterwalder-Sei...

Critical behavior of the Schwinger model with Wilson fermions.